mirror of
https://github.com/brain-hackers/u-boot-brain
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182 lines
3.6 KiB
C
182 lines
3.6 KiB
C
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/*
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* (C) Copyright 2001
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* Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <command.h>
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#define EEPROM_CAP 0x50000358
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#define EEPROM_DATA 0x5000035c
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unsigned int eepromReadLong(int offs)
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{
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unsigned int value;
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volatile unsigned short ret;
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int count;
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*(unsigned short *)EEPROM_CAP = offs;
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count = 0;
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for (;;)
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{
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count++;
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ret = *(unsigned short *)EEPROM_CAP;
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if ((ret & 0x8000) != 0)
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break;
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}
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value = *(unsigned long *)EEPROM_DATA;
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return value;
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}
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unsigned char eepromReadByte(int offs)
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{
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unsigned int valueLong;
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unsigned char *ptr;
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valueLong = eepromReadLong(offs & ~3);
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ptr = (unsigned char *)&valueLong;
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return ptr[offs & 3];
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}
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void eepromWriteLong(int offs, unsigned int value)
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{
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volatile unsigned short ret;
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int count;
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count = 0;
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*(unsigned long *)EEPROM_DATA = value;
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*(unsigned short *)EEPROM_CAP = 0x8000 + offs;
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for (;;)
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{
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count++;
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ret = *(unsigned short *)EEPROM_CAP;
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if ((ret & 0x8000) == 0)
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break;
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}
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}
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void eepromWriteByte(int offs, unsigned char valueByte)
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{
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unsigned int valueLong;
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unsigned char *ptr;
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valueLong = eepromReadLong(offs & ~3);
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ptr = (unsigned char *)&valueLong;
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ptr[offs & 3] = valueByte;
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eepromWriteLong(offs & ~3, valueLong);
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}
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void i2c_read (uchar *addr, int alen, uchar *buffer, int len)
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{
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int i;
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int len2, ptr;
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/* printf("\naddr=%x alen=%x buffer=%x len=%x", addr[0], addr[1], *(short *)addr, alen, buffer, len); // test-only */
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ptr = *(short *)addr;
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/*
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* Read till lword boundary
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*/
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len2 = 4 - (*(short *)addr & 0x0003);
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for (i=0; i<len2; i++)
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{
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*buffer++ = eepromReadByte(ptr++);
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}
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/*
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* Read all lwords
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*/
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len2 = (len - len2) >> 2;
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for (i=0; i<len2; i++)
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{
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*(unsigned int *)buffer = eepromReadLong(ptr);
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buffer += 4;
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ptr += 4;
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}
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/*
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* Read last bytes
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*/
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len2 = (*(short *)addr + len) & 0x0003;
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for (i=0; i<len2; i++)
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{
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*buffer++ = eepromReadByte(ptr++);
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}
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}
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void i2c_write (uchar *addr, int alen, uchar *buffer, int len)
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{
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int i;
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int len2, ptr;
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/* printf("\naddr=%x alen=%x buffer=%x len=%x", addr[0], addr[1], *(short *)addr, alen, buffer, len); // test-only */
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ptr = *(short *)addr;
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/*
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* Write till lword boundary
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*/
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len2 = 4 - (*(short *)addr & 0x0003);
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for (i=0; i<len2; i++)
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{
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eepromWriteByte(ptr++, *buffer++);
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}
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/*
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* Write all lwords
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*/
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len2 = (len - len2) >> 2;
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for (i=0; i<len2; i++)
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{
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eepromWriteLong(ptr, *(unsigned int *)buffer);
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buffer += 4;
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ptr += 4;
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}
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/*
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* Write last bytes
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*/
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len2 = (*(short *)addr + len) & 0x0003;
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for (i=0; i<len2; i++)
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{
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eepromWriteByte(ptr++, *buffer++);
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}
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}
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